Where names come from
Some names are descriptive of the sequence (GHK for glycine-histidine-lysine). Some are development codes that stuck (BPC-157, TB500). Some are assigned non-proprietary names (somatropin, tesamorelin). None of these tells you anything about quality; they are labels with different origins.
Fragment notation
A name like ACTH(4-10) means residues four to ten of the parent sequence. It is a precise statement, and a peptide described as a fragment without those numbers is under-specified.
Analogue suffixes
Suffixes such as LR3 describe a modification to a parent molecule — in that case a long R3 variant with an N-terminal extension and a substitution at position three. The suffix is part of the identity, not a grade or a version number.
Salt forms
Synthetic peptides are usually isolated as salts, commonly acetate or trifluoroacetate. The salt is part of the delivered mass, which is why the mass of powder in a vial exceeds the mass of peptide in it.
Research use only. This page is explanatory and does not recommend any use, quantity or procedure. REVIVE LAB supplies reference materials for laboratory research. These are not medicines and are not for human or veterinary consumption. Anyone considering the use of any compound in humans should do so only under qualified medical supervision.